qfontengine_x11.cpp

奇趣公司比较新的qt/emd版本

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#include "qbitmap.h"

// #define FONTENGINE_DEBUG

#include <qbytearray.h>
#include <qdebug.h>
#include <qtextcodec.h>

#include "qfontdatabase.h"
#include "qpaintdevice.h"
#include "qpainter.h"
#include "qvarlengtharray.h"
#include "qwidget.h"
#include "qsettings.h"
#include "qfile.h"

#include <private/qpaintengine_x11_p.h>
#include "qfont.h"
#include "qfont_p.h"
#include "qfontengine_p.h"
#include <qhash.h>

#include <private/qpainter_p.h>
#include <private/qunicodetables_p.h>

#include <private/qt_x11_p.h>
#include "qx11info_x11.h"
#include "qfontengine_x11_p.h"

#include <limits.h>


// ------------------------------------------------------------------
// Multi XLFD engine
// ------------------------------------------------------------------

QFontEngineMultiXLFD::QFontEngineMultiXLFD(const QFontDef &r, const QList<int> &l, int s)
    : QFontEngineMulti(l.size()), encodings(l), screen(s), request(r)
{
    loadEngine(0);
    fontDef = engines[0]->fontDef;
}

QFontEngineMultiXLFD::~QFontEngineMultiXLFD()
{ }

void QFontEngineMultiXLFD::loadEngine(int at)
{
    Q_ASSERT(at < engines.size());
    Q_ASSERT(engines.at(at) == 0);
    const int encoding = encodings.at(at);
    QFontEngine *fontEngine = QFontDatabase::loadXlfd(0, QUnicodeTables::Common, request, encoding);
    Q_ASSERT(fontEngine != 0);
    fontEngine->ref.ref();
    engines[at] = fontEngine;
}

// ------------------------------------------------------------------
// Xlfd font engine
// ------------------------------------------------------------------

#ifndef QT_NO_FREETYPE

static QStringList *qt_fontpath = 0;

static QStringList fontPath()
{
    if (qt_fontpath)
        return *qt_fontpath;

    // append qsettings fontpath
    QSettings settings(QSettings::UserScope, QLatin1String("Trolltech"));
    settings.beginGroup(QLatin1String("Qt"));

    QStringList fontpath;

    int npaths;
    char** font_path;
    font_path = XGetFontPath(X11->display, &npaths);
    bool xfsconfig_read = false;
    for (int i=0; i<npaths; i++) {
        // If we're using xfs, append font paths from /etc/X11/fs/config
        // can't hurt, and chances are we'll get all fonts that way.
        if (((font_path[i])[0] != '/') && !xfsconfig_read) {
            // We're using xfs -> read its config
            bool finished = false;
            QFile f(QLatin1String("/etc/X11/fs/config"));
            if (!f.exists())
                f.setFileName(QLatin1String("/usr/X11R6/lib/X11/fs/config"));
            if (!f.exists())
                f.setFileName(QLatin1String("/usr/X11/lib/X11/fs/config"));
            if (f.exists()) {
                f.open(QIODevice::ReadOnly);
                while (f.error()==QFile::NoError && !finished) {
                    QString fs = QString::fromLocal8Bit(f.readLine(1024));
                    fs=fs.trimmed();
                    if (fs.left(9)==QLatin1String("catalogue") && fs.contains(QLatin1Char('='))) {
                        fs = fs.mid(fs.indexOf(QLatin1Char('=')) + 1).trimmed();
                        bool end = false;
                        while (f.error()==QFile::NoError && !end) {
                            if (fs[int(fs.length())-1] == QLatin1Char(','))
                                fs = fs.left(fs.length()-1);
                            else
                                end = true;

                            fs = fs.left(fs.indexOf(QLatin1String(":unscaled")));
                            if (fs[0] != QLatin1Char('#'))
                                fontpath += fs;
                            fs = QLatin1String(f.readLine(1024));
                            fs = fs.trimmed();
                            if (fs.isEmpty())
                                end = true;
                        }
                        finished = true;
                    }
                }
                f.close();
            }
            xfsconfig_read = true;
        } else {
            QString fs = QString::fromLocal8Bit(font_path[i]);
            fontpath += fs.left(fs.indexOf(QLatin1String(":unscaled")));
        }
    }
    XFreeFontPath(font_path);

    // append qsettings fontpath
    QStringList fp = settings.value(QLatin1String("fontPath")).toStringList();
    if (!fp.isEmpty())
        fontpath += fp;

    qt_fontpath = new QStringList(fontpath);
    return fontpath;
}

static QFontEngine::FaceId fontFile(const QByteArray &_xname, QFreetypeFace **freetype, int *synth)
{
    *freetype = 0;
    *synth = 0;

    QByteArray xname = _xname.toLower();

    int pos = 0;
    int minus = 0;
    while (minus < 5 && (pos = xname.indexOf('-', pos + 1)))
        ++minus;
    QByteArray searchname = xname.left(pos);
    while (minus < 12 && (pos = xname.indexOf('-', pos + 1)))
        ++minus;
    QByteArray encoding = xname.mid(pos + 1);
    //qDebug("xname='%s', searchname='%s', encoding='%s'", xname.data(), searchname.data(), encoding.data());
    QStringList fontpath = ::fontPath();
    QFontEngine::FaceId face_id;
    face_id.index = 0;

    QByteArray best_mapping;

    for (QStringList::ConstIterator it = fontpath.constBegin(); it != fontpath.constEnd(); ++it) {
        if ((*it).left(1) != QLatin1String("/"))
            continue; // not a path name, a font server
        QString fontmapname;
        int num = 0;
        // search font.dir and font.scale for the right file
        while (num < 2) {
            if (num == 0)
                fontmapname = (*it) + QLatin1String("/fonts.scale");
            else
                fontmapname = (*it) + QLatin1String("/fonts.dir");
            ++num;
            //qWarning(fontmapname);
            QFile fontmap(fontmapname);
            if (!fontmap.open(QIODevice::ReadOnly))
                continue;
            while (!fontmap.atEnd()) {
                QByteArray mapping = fontmap.readLine();
                QByteArray lmapping = mapping.toLower();

                //qWarning(xfontname);
                //qWarning(mapping);
                if (!lmapping.contains(searchname))
                    continue;
                int index = mapping.indexOf(' ');
                QByteArray ffn = mapping.mid(0,index);
                // remove bitmap formats freetype can't handle
                if (ffn.contains(".spd") || ffn.contains(".phont"))
                    continue;
                bool best_match = false;
                if (!best_mapping.isEmpty()) {
                    if (lmapping.contains("-0-0-0-0-")) { // scalable font
                        best_match = true;
                        goto found;
                    }
                    if (lmapping.contains(encoding) && !best_mapping.toLower().contains(encoding))
                        goto found;
                    continue;
                }

            found:
                int colon = ffn.lastIndexOf(':');
                if (colon != -1) {
                    QByteArray s = ffn.left(colon);
                    ffn = ffn.mid(colon + 1);
                    if (s.contains("ds="))
                        *synth |= QFontEngine::SynthesizedBold;
                    if (s.contains("ai="))
                        *synth |= QFontEngine::SynthesizedItalic;
                }
                face_id.filename = (*it).toLocal8Bit() + '/' + ffn;
                best_mapping = mapping;
                if (best_match)
                    goto end;
            }
        }
    }
end:
//     qDebug("fontfile for %s is from '%s'\n    got %s synth=%d", xname.data(),
//            best_mapping.data(), face_id.filename.data(), *synth);
    *freetype = QFreetypeFace::getFace(face_id);
    if (!*freetype) {
        face_id.index = 0;
        face_id.filename = QByteArray();
    }
    return face_id;
}

#endif // QT_NO_FREETYPE

// defined in qfontdatabase_x11.cpp
extern int qt_mib_for_xlfd_encoding(const char *encoding);
extern int qt_xlfd_encoding_id(const char *encoding);

static inline XCharStruct *charStruct(XFontStruct *xfs, uint ch)
{
    XCharStruct *xcs = 0;
    unsigned char r = ch>>8;
    unsigned char c = ch&0xff;
    if (xfs->per_char &&
         r >= xfs->min_byte1 &&
         r <= xfs->max_byte1 &&
         c >= xfs->min_char_or_byte2 &&
         c <= xfs->max_char_or_byte2) {
        xcs = xfs->per_char + ((r - xfs->min_byte1) *
                               (xfs->max_char_or_byte2 -
                                xfs->min_char_or_byte2 + 1)) +
              (c - xfs->min_char_or_byte2);
        if (xcs->width == 0 && xcs->ascent == 0 &&  xcs->descent == 0)
            xcs = 0;
    }
    return xcs;
}

QFontEngineXLFD::QFontEngineXLFD(XFontStruct *fs, const QByteArray &name, int mib)
    : _fs(fs), _name(name), _codec(0), _cmap(mib)
{
    if (_cmap) _codec = QTextCodec::codecForMib(_cmap);

    cache_cost = (((fs->max_byte1 - fs->min_byte1) *
                   (fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1)) +
                  fs->max_char_or_byte2 - fs->min_char_or_byte2);
    cache_cost = ((fs->max_bounds.ascent + fs->max_bounds.descent) *
                  (fs->max_bounds.width * cache_cost / 8));
    lbearing = SHRT_MIN;
    rbearing = SHRT_MIN;
    face_id.index = -1;
    freetype = 0;
    synth = 0;
}

QFontEngineXLFD::~QFontEngineXLFD()
{
    XFreeFont(QX11Info::display(), _fs);
    _fs = 0;
#ifndef QT_NO_FREETYPE
    if (freetype)
        freetype->release(face_id);
#endif
}

bool QFontEngineXLFD::stringToCMap(const QChar *s, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const
{
    if (*nglyphs < len) {
        *nglyphs = len;
        return false;
    }

    // filter out surrogates, we can't handle them anyway with XLFD fonts
    QVarLengthArray<ushort> _s(len);
    QChar *str = (QChar *)_s.data();
    for (int i = 0; i < len; ++i) {
        if (i < len - 1